Quantum82 -- Have you ever visited Anastasia State Park? The good news first: It has a beautiful beach. The bad news second: The best HIGH sites are for the size of popup campers; that is why most pop up camper clubs and rallies are held at this park.
The first and only time we stayed there, we were assigned a larger and a very low site for our 27-foot RV off of a graded dirt road; when we backed in, it was like we were backing into a gold-fish bowl; the graded dirt road was high above the site. We knew that in the last few days there had been a lot of rain and flooding in the St. Augustine area, but we thought it was over until we checked the weather report after we had parked the RV. Yes, another deluge was coming that same night, and we were sitting in a goldfish bowl. We talked the weather problem over with other campers with similar sites along the dirt road, they also decided that they did not want to be caught in a mud pit if another storm came. But if you have a small pop up camper, you will be in hog heaven with the high (but small) sandy lots. However, those lots will not fit medium to large RVs.